Chaeles f



PATENT OFFICE'.

CHARLES E. GEAEY, E NEW YORK, N. Y.

BURG LAR-ALARM AND DO'O R` FASTENING.

SPECIFICATION"` forming part of Letters Patent No. 237,076, datedJanuary 25, 1881-. Application filed November l1, 1880. (No model.)

To all whom it may concern Be it known that I, CHAELEs F. OEAEY, of thecity, county, and `State of New York, have invented a new and usefulImprovement in Door Fasteners and Alarms, oi' which the following is aful1-,`clear and exact description. Y

The object of my invention is to furnish de- 4vices by which doors canbe readily and securely fastened when shut, and by which an alarm shallbe given in case the fastenings are tamperedwith. I provide fasteningsthat are fitted for connection with the knob-spindle, so as to preventits being turned v suliiciently to release the latch, and the fasteningsare connected with an alarm-bell which is brought into operation by aslight movement of the knob.

In the accompanying drawings, Figure 1 is an elevation, showing myfastener and alarm as applied to a door. Fig. 2 is a vertical sectionthrough the bell, showing also its connection to the fastenings. Fig. 3is a section of the bell on line'w w of Fig. 1. Fig. 4 represents thebracket'for receiving the hook ofthe fastening. Fig. 5 is a face view ofthe bell.

Similar letters 'of reference indicate correj sponding parts.

`A represents a door, of which a is the knob, andB represents thedoorjamb.

C is a lever secured to the spindle of knob a, and having a chain, b,passing from each end to a hook, c, that is connected to a bracket, d,secured at a suitable place on the jamb B. The lever G may be secured tothe knob-spindle in any suitable manner. A strap from the lever may beplacedaround thespindle and secured by a screw, or the spindle be iittedwith an aperture-block to receive the lever; but I prefer theconstruction shown. To the spindlela block, e, is secured by the screwwhich holds the knob. The lever C is provided at its mid-length witha,1ug,j, having a pin, f', that enters an aperture of block e. Thisconstruction is simple and permits the ready connection anddisconnection of the lever, and as the lever has simply to be raised forits disconnection there will be no risk of mistake by confusion. The pinf is curved, so that in releasing it from the block the chain at thellower end will be drawn upon suficiently to operate the alarm, thisbeing for giving an alarm in case an attempt is made to remove the leverby an intruder. Theupper end of the lever is formed with a hook, asshown, by which it can be suspended when not in use.

D is the alarm, consisting of clockwork provided with a spring, theWinding-arbor g of which passes through a stud, h, formed on the irontplate of the works, to which stud the bell is secured, so that the'worksare covered by the bell. The hammer k is fitted to vibrate in an arc atthe edge of the bell, the bell being either cut out to receive thehammer, as shown,

or formed at its inner side with a lug, against Which the hammer willstrike.

l is the trigger, provided with a spiral spring acting to force thetrigger end against the hammer-arm to prevent its vibration.

m is a lever pivoted to a stud of the works, so that its longer arm willengage with a notch in trigger when the latter is fully drawn out,thereby holding the trigger and allowing the bell to ring until thelever is disconnected by hand. By this construction a slight movement ofthe trigger l will cause a tap or two of the bell, and a longer pullwill cause continuous ringing.

From the outer end of trigger l a wire, fn, passes to the hook c of theknob-fastenings, and an elbow-lever is used if required by the positionof the bell.

The bracket d is of peculiar construction, whereby it will retain thehook and allow sut'- icient movement of the hook to operate the bell. Asshown in Fig. 4, the bracket is formed with two lugs, d', in which arelong slots for the hook to pass through, and the wire nfrom the alarm isconnected tothe hook between the lugs d. The wire and chains being drawntaut, the hook can move in the slots of the lugs sufficiently to operatethe alarm, and is then held fast by the lugs to prevent the knob fromturning farther.

From the above description it will be seen that the knob of the door isfastened so that it cannot be turned sufficiently to release the latch;also, that in case the knob is turned slightly in either direction thealarm will be sprung.

These devices are simple and inexpensive and may be applied to anydoor-knob.

ICO

2. In a burglar-alarm connecting with a door-knob, the lever C, providedwith a median r 5 lug, f, having a curved pin,f, in combination with anapertured block, e, as shown and described.

3. In a. burglaralarm, the lever m, arranged to engage with its longerarm in a. notch of zo trigger l, as and for the purpose specified.

CEAS. F. CRARY.

Witnesses:

GEO. D. WALKER, C. SEDGWICK.

